Robotic End-of-Arm Tooling worked example

Field Failure Reserve at 5.76% expected field failure rate: a worked example in robotic end-of-arm tooling

Here is what the math looks like when conditions slip. We hold every other input steady and drop expected field failure rate to 5.76%, then walk the calculation through step by step. Size a warranty and service reserve for deployed EOAT from fleet size, per-event cost, and expected field failure rate.

The inputs for this scenario

  • Deployed EOAT units: 320 units (held at the documented default)
  • Service event cost per unit: 480 $ / unit (held at the documented default)
  • Expected field failure rate: 5.76 % (the input this scenario stresses; the baseline uses 8)
  • Spares stocking and dispatch setup: 2,500 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Field failure reserve = deployed EOAT units x service event cost per unit x expected field failure rate + spares stocking and dispatch setup.
  • Total field failure reserve cost works out to 11,347 $ at these inputs, and this is the headline figure for the scenario.
  • Field failure reserve cost per unit works out to 35.46 $ / piece at these inputs.
  • Variable field failure reserve cost works out to 8,847 $ at these inputs.
  • Fixed field failure reserve adder works out to 2,500 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where expected field failure rate sits at 8% and the headline result is 14,788 $, this scenario comes in 23.27% below the baseline at 11,347 $.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to expected field failure rate, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It applies a single average failure rate and service cost, so it will misstate reserves for fleets with mixed duty cycles, early infant-mortality spikes, or end-of-life wear-out clustering.

Results at a glance

  • Total field failure reserve cost: 11,347 $ (headline result)
  • Field failure reserve cost per unit: 35.46 $ / piece
  • Variable field failure reserve cost: 8,847 $
  • Fixed field failure reserve adder: 2,500 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Field Failure Reserve calculator, set expected field failure rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.